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网页结构 shift+! 
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>html元素回顾</title>
</head>
<body>
    <h1>一级标题</h1>
    <h2>二级标题</h2>

    <p>段落内容</p>

    <img src="https://img.alicdn.com/imgextra/i3/2053469401/O1CN01g8ituT2JJiCsKjmDz_!!2053469401.png" alt="alt" width="100">
    <img src="https://img2.baidu.com/it/u=717979571,3244631707&fm=253&fmt=auto&app=138&f=JPEG?w=1280&h=400" alt="alt" width="100">
    
    <img src="img/11.jpg"/>

    <div>元素一</div>
    <span>元素二</span><span>元素三</span>

    <a href="http://www.baidu.com">百度</a>

    <br/>
    <input type="text" placeholder="请输入内容"/>
    <input type="password">
    <input type="radio">男<input type="radio">女
    <input type="checkbox" name="check1" id="check1">
</body>
</html>
